Towards stable and efficient electrolytes for room-temperature rechargeable calcium batteries

Abstract

A novel Ca electrolyte with a broad electrochemical window and high ionic conductivity is demonstrated.

Dawn of Calcium Batteries

“…80 % coulombic efficiency after a few conditioning cycles on a platinum electrode with ca. 300 mV overpotential and an anodic stability above 4.0 V vs. Ca (Figure A,B) . Equally important, this electrolyte also showed oxidative stabilities of 4.2 V and 4.8 V for stainless steel and Al, which are common current collectors found in rechargeable batteries (Figure C).…”

“…300 mV overpotential and an anodic stability above 4.0 V vs.C a ( Figure 1A,B). [7] Equally important, this electrolyte also showed oxidative stabilities of 4.2 Va nd 4.8 Vf or stainless steel and Al, which are common current collectors found in rechargeable batteries ( Figure 1C). This group further demonstrated ahigh conductivity of a0.25 m solution in DME (8.3 mS cm À1 )a nd ah igh thermal stability of the Ca[B(hfip) 4 ] 2 salt (> 120 8 8C).…”

Wiederaufladbare Calcium‐Batterien

“…Abdruck mit Genehmigung aus Lit. . Copyright Royal Chemical Society und American Chemical Society (2019).…”

High Performance Voltage Tailorable Room-temperature Ca-metal Batteries

“…[4][5][6][7] The anion oxidation phenomenon could be alleviated at relatively high temperature or by changing the electrolyte salts from Ca(PF 6 ) 2 , Ca(BF 4 ) 2 , and Ca(BH 4 ) 2 to corresponding uorinated alkyl borates. 4,[8][9] However, due to this issue arising from the character of calcium itself, it still needs long-term collaboration from both electrolyte chemistry and calcium-metal surface/interface engineering to fundmentally solve this bottleneck problem as that in lithium-metal technology.…”